Scissors or knife grinder.



No. 642,180. Patented Jan. 30, I900. w. H. TWIST. v

SCISSDRS 0R KNIFE GRINDER.

(Application filed May 24, 1899.)

(No Model.)

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lllitn STATES PATENT OFFICE.

WILLIAM H. TNIST, OF CLEVELAND, OHIO, ASSIGNOR OF ONE-HALF TO G. V.

ASHDOWN, on

SAME PLACE.

SCISSORS OR KNIFE GRINDER.

SPECIFICATION forming part of Letters Patent No. 642,180, dated January 30, 1900. Application filed May 24,1899. Serial No. 718,072. (No model.)

To on whom, it may concern:

Be it known that I, WILLIAM H. TWIST, acitizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Scissors and Knife Grinders; and I do declare that the following is a full, clear, and exact description of thein vention, which will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to improvements in scissors and knife grinders; and the invention consists in a grinding device having the novel features of construction and serving to operate substantially as shown and described, and particularly pointed out in the claims.

In the accompanying drawings, Figure l is what may be termed a front elevation of my improved grinder with a pair of scissors held in grinding relation thereto. Fig. 2 is a side elevation of the machine with scissors held thereon as shown in Fig. 1. Fig. 3 is a sectional elevation on line 3 3, Fig. 1; and Fig. is a perspective view of a knife-holder instead of scissors-holder and of a section of a knife gripped thereby as in grinding.

A represents what is preferably made a single piece of casting or a cast-metal frame in one piece and comprising a standard or upright portion 2, provided with a pair of clamping-jaws 3 at its bottom adapted to engage the edge of the table or the like, and a jamscrew l to tighten up the device when connection is made, as indicated. At its top an elbowed arm 5 stands oif from the standard portion 2 of the device and in parallel relation there to, and through these two parts projects a shaft 13, having its hearings in the said standard 2 and arm 3. The grindingwheel 0, emery or stone or the like, is fixed on said shaft outside arm 5, and a sprocketpinion D is fixed on the other end thereof outside standard 2.

A large drive-wheel E is supported on a short spindle on standard 2 below pinion D and is operatively connected with said pinion by a sprocket-chain F, a suitable handle 6 serving to turn the sprocket-wheel. This construction enables the operator to rotate the grinding-wheel in either direction and at .arln H on said post.

any desired speed of rotation, and the structure as it stands is at once firm and strong and adapted to take care of itself when fixed in position.

Now, having the portion of device as described, it is desirable also to have means supplemental thereto adapted to serve the purpose of both a holder and guide for the article to be sharpened, whether scissors, knife, or other tool or utensil. As a holder the device should hold absolutely and not partially, and as a guide it should serve to fiX the bevel or inclination of the grinding and maintain that uniformly from end to end of its name ment over the grinding-wheel. To these several ends I have provided supplemental mechanism which is adjustable in respect to the stationary framework or support already described and which is variously adaptable, as will now appear. Thus, as shown, a supportin g and guiding rod G is slidably and rotarily carried in and through the extremities of standard 2 and elbow-arm 5 and is of such length as to afford all the room desired for all 7 5 lengthwise adjustments and not leave its bearings in supports 2 and 5. However, said rod is easily drawn out when occasion requires. Upon this rod are employed at least two kinds of holders, one for scissors or shears and another for knives or blades of the knife kind. The form of the scissors-holder H is shown in side elevation in Fig. 1 and in cross-section, Fig. 3. Said holder itself consists of two parts, an adjustable post h and an adjustable The post is sleeved closely on rod G and held in any desired position thereon by a set-screw 8, and to the end of this post is adjustably secured arm H by means of a thumb-screw 7t through a longitudinal slot 7L2 in said arm. The arm and the post are designed to hold a right-angled relation at all times, and this is promoted by a lip 72. on the post below the point where screw h enters, and the arm slides on this lip or shoulder. There are, therefore, in this ass0- ciation of parts three distinct movements provided for, the sliding of rod G in its bearings 2 and 5 to sharpen the full length of the blade, the rotation of said rod to adapt the arm to I00 position and use, and the adjustment of the arm in its slot to determine the angle or the sharpened.

bevel at which the sharpening is to be accomplished.

Obviously, as'seen in Fig. l, the closer the blade is brought to the top of the wheel C the shorter will be the bevel, so that in sharpening knives particularly the blade will want to strike the wheel a considerable distance below that shown for the shears in these figures. The arm H is, therefore, purposely fashioned with an elbow at about the angle shown and in its outer end has jaws and a thumb-screw h to engage the blade and fasten it firmly, so that nothing more than these means are needed to hold the blade. This being done and the angle of bevel being adjusted, there remains nothing for the operator to do but apply the power with one hand and turn the grinding-wheel at any desired speed and in either direction and with the other hand feed the blade along, bearing on more or less according to conditions. Then as one part is sharpened release that part and secure the other one and repeat the Work with that one.

In Fig. 4 I show a modification of the arm H in means for supporting a knife-blade K. Here there is a single straight arm N fixed to rod G directly, so that when these are used the rod G and arm H are withdrawn and these substituted. Connected with the arm N is a reverse arm N, having an open or slotted head n engaged over a dog or catch n on the extremity of arm N, and a thumb-nut 01 serves to bring the meeting edges of said arms together when tightened and grip the blade K. These arms in their function operate as jaws or clamps, and are so regarded. A single fastening of the blade in these jaws suffices, and when one side is sharpened the arms and blade are thrown together to the other side of the wheel and the other side is In this latter form of holder the angle of bevel or sharpening is fixed by moving the blade nearer to or farther from the pivot on rod G between the clamping parts N and N, and in both holders there is enough freedom of the blade in the clamp or jaws to accommodate it to grinding-wheel and hold the desired relation in case any movement of the blade at this point be deemed necessary.

The spindle upon which the drive-wheel E is supported passes through a vertical slot e in standard 2, and a nut e fastens the same in any position as set. This provides means for taking up the slack in chain F.

In respect to the arm N and the knife-blade it should be stated that the said arm is designed to be so constructed and arranged in respect to the rod G that the edge of the knife will lie directly opposite thecenter of said rod. Then as the blade is thrown from one side to the other for grinding it will be ground uniformly and alike on both sides.

What I claim as new, and desire to secure by Letters Patent, is-

1. The standard having an angle-arm at one side, a shaft in said standard and arm and a grinding-Wheel thereon, in combination with a rod extending through the top of said standard and arm parallel to the said shaft and slidably supported therein and a blade-holding arm engaged on said rod and constructed to support the blade in varying relations to the grinding-Wheel, and means to rotate the grinding-wheel in either direction, substantially as described.

2. The standard constructed to be removably clamped to a support and the grinding wheel and its shaft, and means to turn the wheel supported on the said standard, in combination with a rod slidably and rotarily sup ported in said standard above and parallel to said shaft, a post fixed to the said rod, and an arm for holding the blade to be sharpened adjustably secured to the said post, substantially as described.

3. In a device substantially as described, means for holding and guiding a blade to be sharpened, comprising a supporting-rod, a post fixed to said rod and an arm having clamping-jaws and a thumb-screw to engage the blade to be sharpened and a slot lengthwise thereof and a screw through said slot to fasten the arm to said post, substantially as described.

Witness my hand to the foregoing specification this 10th day of May, 1899.

WILLIAM II. TWIST.

' Witnesses:

H. E. MUDRA, R. B. Mosnn. 

